Bsi bs en 60534 8 1 2005

INDUSTRIAL-PROCESS CONTROL VALVES – Part 8-1: Noise considerations – Laboratory measurement of noise generated by aerodynamic flow through control valves 1 Scope This part of IEC 6053

Industrial-process

control valves —

Part 8-1: Noise considerations —

Laboratory measurement of noise

generated by aerodynamic flow

through control valves

The European Standard EN 60534-8-1:2005 has the status of a

British Standard

ICS 23.060.40; 17.140.20; 25.040.40

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This British Standard was

published under the authority

of the Standards Policy and

Strategy Committee

on 1 February 2006

© BSI 1 February 2006

ISBN 0 580 47390 2

National foreword

This British Standard is the official English language version of

EN 60534-8-1:2005 It is identical with IEC 60534-8-1:2005 It supersedes

BS EN 60534-8-1:2001 which is withdrawn

The UK participation in its preparation was entrusted by Technical Committee systems, which has the responsibility to:

— aid enquirers to understand the text;

— present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep

UK interests informed;

— monitor related international and European developments and promulgate them in the UK

A list of organizations represented on this subcommittee can be obtained on request to its secretary

Cross-references

The British Standards which implement international or European

publications referred to in this document may be found in the BSI Catalogue

under the section entitled “International Standards Correspondence Index”, or

by using the “Search” facility of the BSI Electronic Catalogue or of British

Standards Online

This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a back cover

The BSI copyright notice displayed in this document indicates when the document was last issued

Amendments issued since publication

GEL/65, Measurement and control, to Subcommittee GEL/65/2, Elements of

NORME EUROPÉENNE

CENELEC

European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members

Ref No EN 60534-8-1:2005 E

ICS 23.060.40; 17.140.20; 25.040.40 Supersedes EN 60534-8-1:2000

English version

Industrial-process control valves Part 8-1: Noise considerations - Laboratory measurement of noise generated by aerodynamic flow through control valves

(IEC 60534-8-1:2005)

Vannes de régulation des processus

industriels

Partie 8-1: Considérations sur le bruit -

Mesure en laboratoire du bruit créé

par un débit aérodynamique

à travers une vanne de régulation

(CEI 60534-8-1:2005)

Stellventile für die Prozessregelung Teil 8-1: Geräuschbetrachtungen - Laboratoriumsmessungen von Geräuschen bei gasdurchströmten Stellventilen

(IEC 60534-8-1:2005)

This European Standard was approved by CENELEC on 2005-09-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom

Foreword

The text of document 65B/558/FDIS, future edition 2 of IEC 60534-8-1, prepared by SC 65B, Devices,

of IEC TC 65, Industrial-process measurement and control, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60534-8-1 on 2005-09-01

This European Standard supersedes EN 60534-8-1:2000

This standard has been revised to obtain consistency in describing the methods for measuring internal and external sound pressure measurements and to update the description of the instrumentation from analog to digital

The following dates were fixed:

– latest date by which the EN has to be implemented

at national level by publication of an identical

– latest date by which the national standards conflicting

Annex ZA has been added by CENELEC

Endorsement notice

The text of the International Standard IEC 60534-8-1:2005 was approved by CENELEC as a European Standard without any modification

CONTENTS

1 Scope 4

2 Normative references 4

3 Terms and definitions 5

4 Symbols 5

5 Method A (external sound pressure measurement) 6

5.1 Test system 6

5.1.1 Pressure regulating devices 6

5.1.2 Test specimen 6

5.1.3 Test section piping 6

5.1.4 Pressure taps 7

5.1.5 Acoustic environment 7

5.1.6 Instrumentation 7

5.2 Test procedure 7

5.2.1 Test fluids 7

5.2.2 Sound level sensor position 7

5.2.3 Blow-down test limitations 7

5.2.4 Test data accuracy 8

5.2.5 Test data 8

5.2.6 Accuracy 9

5.3 Data evaluation 9

6 Method B (internal sound pressure measurement) 12

6.1 Test system 12

6.1.1 Pressure regulating devices 12

6.1.2 Test specimen 13

6.1.3 Test section piping 13

6.1.4 Pressure taps 13

6.1.5 Number of measuring points 13

6.1.6 Instrumentation for noise measurement 13

6.2 Testing procedures 14

6.2.1 Test fluid 14

6.2.2 Fluid velocity 14

6.2.3 Background noise 14

6.2.4 Sound level sensor position 14

6.2.5 Blow-down test limitations 15

6.2.6 Test data accuracy 15

6.2.7 Test data 15

6.2.8 Accuracy 16

6.3 Data evaluation 16

Annex ZA (normative) – Normative references to international publications with their corresponding European publications 17

Figure 1 – Control valve noise test – System components 9

Figure 2 – Test arrangements 11

Figure 3 – Arrangement of a test stand (principle) 12

Figure 4 – Mounting position of the sound level meter in the pipe for Δh 0,5 mm 14

INDUSTRIAL-PROCESS CONTROL VALVES –

Part 8-1: Noise considerations – Laboratory measurement of noise generated

by aerodynamic flow through control valves

1 Scope

This part of IEC 60534-8 defines equipment, methods, and procedures for obtaining laboratory measurements of sound pressure levels radiated by control valves and/or associated piping configurations, including fixed restrictions, through which compressible fluids are passing Control valves discharging to atmosphere are excluded from this standard

Method A is a uniform method of measuring the radiated noise from the valve and associated test piping and allows a comparison of various measuring results which is beneficial for both user and manufacturer The noise criteria are expressed by determining the sound pressure level of the valve under consideration

Method B is a procedure for measuring the sound pressure levels within pipe systems upstream and downstream of the valve under fixed operating conditions Since inaccuracies due to the pipe transmission are eliminated, this method is preferred for evaluation of the acoustical characteristic of valves

The noise characteristics to be determined are useful for the following reasons:

a) to compare the performance of different valves;

b) to plan measures for noise abatement;

c) to determine acoustical characteristics of valves and valve assemblies;

d) to enable proper sizing of sound absorbers;

e) to determine possible adverse effects on ultra-sonic flow meter measurements

2 Normative references

The following referenced documents are indispensable for the application of this document For dated references, only the edition cited applies For undated references, the latest edition

of the referenced document (including any amendments) applies

IEC 60534-1, Industrial-process control valves – Part 1: Control valve terminology and

general considerations

IEC 60534 (all parts), Industrial-process control valves

IEC 60534-2-3, Industrial-process control valves – Part 2-3: Flow capacity – Test procedures IEC 60534-8-3, Industrial-process control valves – Part 8-3: Noise considerations – Control

valve aerodynamic noise prediction method

IEC 61260, Electroacoustics – Octave-band and fractional-octave-band filters

IEC 61672-1:2002, Electroacoustics – Sound level meters – Part 1: Specifications

ISO 3744:1994, Acoustics – Determination of sound power levels of noise sources using

sound pressure – Engineering method in an essentially free field over reflecting plane

ISO 3745:2003, Acoustics – Determination of sound power levels of noise sources – Precision

methods for anechoic and hemi-anechoic rooms

3 Terms and definitions

For the purposes of this document, the following terms and definitions, as well as those given

in IEC 60534-1 and other parts of IEC 60534, apply

3.1

test specimen

any valve or combination of valve, reducer, expander, or other fittings for which test data are

required

NOTE During blow-down testing a closure mechanism should be used in such a way that the closure member

position does not change during blow-down

3.2

blow-down rate

rate at which the inlet pressure to the test specimen changes

NOTE In the blow-down method of testing, the inlet pressure to the test specimen decays during the test period

4 Symbols

IEC 60534-1)

m& Mass flow rate kg/s

Symbol Description Unit

(Δp/p1)

1

attached fittings at choked flow

1

5 Method A (external sound pressure measurement)

5.1 Test system

The test system shown in Figure 1 includes

a) pressure regulating devices (optional);

b) test specimen;

c) test section piping;

d) pressure taps;

e) noise-attenuating devices (optional);

f) means of controlling the acoustic environment (chamber is optional);

g) instrumentation

Alternative test arrangements are shown in Figures 2a and 2b

5.1.1 Pressure regulating devices

Upstream and/or downstream pressure regulating devices are used to regulate the test pressures Caution should be taken to avoid pressure drops which will create significant stream-borne noise If such pressure drops are unavoidable, the use of silencers (see 5.1.5)

is recommended as shown in Figure 1 Flowmeters should be installed in accordance with the manufacturers’ instructions

5.1.2 Test specimen

The test specimen and test section shall not be insulated However, separate tests may be conducted to determine the effects of pipe and/or valve insulation

5.1.3 Test section piping

There is no limitation concerning the maximum length of downstream and upstream piping connected to the test specimen The exposed downstream or upstream pipe within the acoustic environment shall be of one-piece construction, i.e., no flanges, circumferential joints

or other pipe-wall reinforcements, and at least 2 m in length This applies to the downstream pipe when conducting downstream noise tests and to the upstream pipe when conducting upstream noise tests

Any mismatch between the inlet and outlet diameters of the test specimen and the inside diameter of the adjacent piping shall be minimized as far as practical

Non-insulated pipe shall be used Pipe material and pipe wall thickness shall be reported in the test data

5.1.4 Pressure taps

Pressure taps shall be provided for the measurement of pressures They shall conform to IEC 60534-2-3

5.1.5 Acoustic environment

The test environment shall be controlled in such a way that background, reflected, and other extraneous noise be at least 10 dB lower than that radiated by the test section Depending on the test system and the acoustic environment, upstream and downstream silencers may be necessary General considerations for the acoustic environment can be found in ISO 3744 and ISO 3745 No sound pressure level correction shall be made for the presence of extraneous noise

5.1.6 Instrumentation

The instrumentation for sound pressure level measurement shall conform to IEC 61672-1, Class 1 or Class 2 Sound level meter characteristics shall conform to IEC 61672-1, Table 2 (weighting A)

Sound level meter calibration and sensitivity test results shall be corrected to sea-level conditions

Additional instrumentation such as electronic recording devices and computers shall not cause errors in the measured data of more than ±1 dB

5.2 Test procedure

5.2.1 Test fluids

Air is the preferred fluid to be used in the test procedures However, other compressible fluids may be substituted for air The fluid shall be sufficiently dry to ensure that any icing which may take place does not affect the test results Saturated vapours are not acceptable as test fluids unless the saturated vapour being used is the one for which data are required

5.2.2 Sound level sensor position

The sound level sensor shall be located 1 m from the nearest pipe surface The downstream distance shall be a minimum of 1 m from the beginning of the exposed section of the test piping but not less than six nominal pipe diameters downstream of the test specimen outlet (see Figures 2a and 2b) Orientation of the sound level sensor with respect to the piping shall

be in accordance with the requirements of the sound level meter manufacturer

5.2.3 Blow-down test limitations

Blow-down test results are intended to simulate steady-state results When using the blow-down method of testing, the blow-blow-down rate shall be limited so that the time interval during which acoustical data are obtained shall be at least 10 times as long as the response time of the acoustical instrumentation The blow-down rate shall be further limited so that the inlet pressure does not decay more than 2 % of the maximum inlet pressure during the time interval used to obtain acoustic data

5.2.4 Test data accuracy

The accuracy of flow rate, pressure, travel, and temperature measurements shall conform to IEC 60534-2-3

5.2.5 Test data

The following data and description of the test specimen, and equipment facility, shall be recorded

2) Pressure differential and/or downstream pressure kPa or bar

4) Flow rate at reference conditions m 3 /h (see note), kg/s

7) Acoustic data:

The A-weighted sound pressure level and either the one-third-octave or

full-octave band analysis shall be recorded for the frequency range 180 Hz

(250 Hz octave band or 200 Hz one-third-octave band centre frequency) to

22 400 Hz (16 000 Hz octave band or 20 000 Hz one-third-octave band

centre frequency) All measurements which are A-weighted shall be

designated dB(A)

dB or dB(A)

8) Description of the test specimen, including at least the following

a) nominal size of valve

b) description of fittings

c) description of flow direction

d) rated flow coefficient C (Kv or Cv)

e) rated travel/opening angle

Various (see IEC 60534-1) mm/deg

9) Description of the test facility including

a) piping and instrumentation schematic

b) nominal pipe size and wall thickness

c) pipe material

d) description of environment chamber (if appropriate)

e) dimensional sketch of test facility

10) Description of test fluid, including one of the following:

a) molecular mass

b) density

kg/kmol kg/m 3

11) Description of instruments

13) Flow coefficient C (Kv or Cv) at the test travel Various (see IEC 60534-1) 14) Pressure differential ratio factor of a control valve without attached fittings at

15) Pressure differential ratio factor of a control valve with attached fittings at

choked flow, xTP

1

17) Any deviation from this standard

NOTE Volumetric flow rates in m 3 /h refer to normal conditions, which are 101,325 kPa (1,01325 bar) and 273 K, or standard conditions, which are 101,325 kPa (1,01325 bar) and 288,6 K